Answer this question truthfully
### Question: What are the symptoms of Acne vulgaris?
### Response: Sometimes, the hair, sebum, and skin cells clump together into a plug. The bacteria in the plug causes swelling. Then when the plug starts to break down, a pimple grows.
There are many types of pimples. The most common types are:
Whiteheads: These are pimples that stay under the surface of the skin.
Blackheads: These pimples rise to the skin's surface and look black. The black color is not from dirt.
Papules: These are small pink bumps that can be tender.
Pustules: These pimples are red at the bottom and have pus on top.
Nodules: These are large, painful, solid pimples that are deep in the skin.
Cysts: These deep, painful, pus-filled pimples can cause scars.